Locking fastener



FIG. 1 is a left end perspective view showing our new design for a locking fastener.

FIG. 2 is a front elevational view of the locking fastener.

FIG. 3 is a right end perspective view of the locking fastener.

FIG. 4 is an enlarged left side view of the locking fastener; and,

FIG. 5 is an enlarged right side view of the locking fastener. 

CLAIM We claim the ornamental design for a locking fastener, as shown and described. 